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/libavutil/arm/bswap.h

http://github.com/FFmpeg/FFmpeg
C Header | 67 lines | 41 code | 9 blank | 17 comment | 0 complexity | 67b049f644437b90dab9f08f09d2b1eb MD5 | raw file
 1/*
 2 * This file is part of FFmpeg.
 3 *
 4 * FFmpeg is free software; you can redistribute it and/or
 5 * modify it under the terms of the GNU Lesser General Public
 6 * License as published by the Free Software Foundation; either
 7 * version 2.1 of the License, or (at your option) any later version.
 8 *
 9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19#ifndef AVUTIL_ARM_BSWAP_H
20#define AVUTIL_ARM_BSWAP_H
21
22#include <stdint.h>
23#include "config.h"
24#include "libavutil/attributes.h"
25
26#ifdef __ARMCC_VERSION
27
28#if HAVE_ARMV6
29#define av_bswap32 av_bswap32
30static av_always_inline av_const uint32_t av_bswap32(uint32_t x)
31{
32    return __rev(x);
33}
34#endif /* HAVE_ARMV6 */
35
36#elif HAVE_INLINE_ASM
37
38#if HAVE_ARMV6_INLINE
39#define av_bswap16 av_bswap16
40static av_always_inline av_const unsigned av_bswap16(unsigned x)
41{
42    __asm__("rev16 %0, %0" : "+r"(x));
43    return x;
44}
45#endif
46
47#if AV_GCC_VERSION_AT_MOST(4,4)
48#define av_bswap32 av_bswap32
49static av_always_inline av_const uint32_t av_bswap32(uint32_t x)
50{
51#if HAVE_ARMV6_INLINE
52    __asm__("rev %0, %0" : "+r"(x));
53#else
54    uint32_t t;
55    __asm__ ("eor %1, %0, %0, ror #16 \n\t"
56             "bic %1, %1, #0xFF0000   \n\t"
57             "mov %0, %0, ror #8      \n\t"
58             "eor %0, %0, %1, lsr #8  \n\t"
59             : "+r"(x), "=&r"(t));
60#endif /* HAVE_ARMV6_INLINE */
61    return x;
62}
63#endif /* AV_GCC_VERSION_AT_MOST(4,4) */
64
65#endif /* __ARMCC_VERSION */
66
67#endif /* AVUTIL_ARM_BSWAP_H */